摘要
在可见光照射下(λ>450 nm),以负载Fe2+的NaY分子筛制备得到Fe2+-NaY催化剂(简称FeY),研究了FeY/H2O2降解微囊藻毒素-LR(MC-LR)的机理,发现在宽pH范围内,Vis/FeY/H2O2体系对MC-LR降解率大于90%。采用LC-MS跟踪分析降解中间产物,推测了可能的降解路径和3个易被氧化的位点:N-甲基脱氢丙氨酸(Mdha链)上的不饱和双键,3-氨基-9-甲氧基-2,6,8-三甲基-10-苯基-4(E),6(E)-二烯酸(Adda链)上的共轭二烯双键与甲氧基。FeY催化剂稳定性良好,循环使用5次仍保持高活性,此催化体系对藻毒素废水的处理具有潜在的应用价值。
Under the condition of visible light irradiation（λ450 nm）,the degradation mechanism of microcystin-LR was studied using H2O2 and FeY catalyst,which is prepared by means of loading Fe2＋ to the molecular sieve NaY.The results indicate that the degradation rate of microcystin-LR is up to 90% in the wide pH range using Vis/FeY/H2O2 system.Based on the intermediates detected by LC-MS analysis,the possible pathways and three vulnerable oxidation sites are put forward：（1） the conjugated double bonds of the Adda chain,（2） the methoxy group of the Adda chain,（3） unsaturated double bond of the Mdha chain.FeY catalyst is of good stability,having catalytic activity after 5 times repetition,which indicates its potential application to the control of the alga wastewater.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
2011年第4期540-543,共4页
Chinese Journal of Analytical Chemistry
基金
国家重点基础研究发展计划(973)项目前期研究课题(No.2008CB417206)
国家自然科学基金(No.20877048)
湖北省高校优秀中青年创新团队计划(No.T200703)资助
